Waste-heat boiler



Sept; 14 1926.

F. FR. BURGER WASTE and BOILER Filed Nov. 1924 2 Sheets-Sheet 1 Sept. 141926.

Fig.5

Filed Nov. 4 1924 2 Sheets-Sheet 2 ()OOO a 0 0 080 0 0 0 O o o 0 0 GOO00 O I O O 9 0 0 0 0 S Q 0 0 0 0 0 2 Q x 0 0 o L o o 0 o o o o o 0 0 o Oo o 0 0 o o o 0 0 0 0 o o g 0 0 08 8 88 53;

Fig.4

' the conditions are, exactly reversed.

FRANZ FR. Bowen, OFVI'MANNHEIM, GERMANY, ASSIGNQR, 13yMESiiTEiASSiGNMENTSQJfi;

TO HEINRICI-ILANZ, AKTIENGEsnLLscHA-r'r, or MANNHEIM, 'BADEN,' 1GERMANY,L

A CORPORATION a. or GERMANY.

I wAstrii -nnarfnqi g v,

a enc ticn filed l i'ovember 4, 1924; Serial 747326, aha iijeeimwDecemberfifi, 1953.;

v This invention relates to a waste" heat a boiler withl superheater;and the object thereofisto provide for boilers'of. this type.

which .is simple in construca superheater tion, efficient in operation,ancl'capable of control so as to avoid the danger. of over heatingtheisteam. Y g j i In intern'allyrfired{steam' boilers means haveheretofore been employejcl for-directa ing theflue gases as they leavethe tube system of the boiler either clirectly into the stackiorentirely through a superheater or in part only through a i' the Isuperheater and Since in such that comparatively littleheat is left forthereafter superheating the" stea1n,- any par-1 f the flue gases aroundthe;

ial y-pas ms i V superheater 13.011lyfl1'1BV1l, rendered necessaryinorcler eitherQto increase their veloc-'.

ity or to-"provicle sufficient heat for thefeeclwater heaters located inthe stack.

In waste'heat' b ,'lers,', on the other hand; I

v The.

heat hereavailable is not so" great as is the case in internally-firedboilers, and hence, 1f the .superheater' were placed behind, the

boiler, it would be impossibleto obtain any super-heat of the steamwhatever, Consequently, jwithfboilers of this type; it is customary toplace the superheater in front of he will lpassihrough it beforeentering "the boiler. The superheater beingthusxexposecl toexceedinglyhigh temperatures, the aim,

directly-the oppositetolthat in the case of an internally-fired.boileris -to so keep down the superheat of the steam as to mimmize the.danger in overheating;

a This problem. has heretofore been solved simply by cooling down theoverheatedsteam infthe Outer -a i. r,' by mingling with it s m -s u a edteam f mlth bo r, 01' by conducting it through a coil' located in'the;

lower and hence coolest part pf llfljbglllg ent l ils de ablefl ss heatth sec-- 7 n req ite spe ia "P p ng -a 1 s an 'pe' vef 'n'cl ompl atemanual cq rol by I aheacl org: boiler,asregards the vcircui V lation ofthe waste gases,so' that the gases 7 A) waste heat boiler withsuperheater having two branches leading'one 'throu'gh' the superheaterand theother directly. to the boiler, anclfcontrol devices located inthese branch passes make it possible to conduct a part'only of the gasesthrough the super.-

hemr n e rem nd o the boiler.

Thisapparatusis also objectionable, iiithe first place, because thecontrol of the suDer-. 5

heat is imperfect, secondly, because ithe high heat of'the waste: gasesis not properly flitilizecl1whe'n a part thereof isfconducte'cl ditrectly 'tothe'boiler, antlyfinally, because it s il possible 9 s t Wa aand the steam 1n "countei current through the superheater.

I have obviated 1511 above-inentioned defects. by '2 my Presentinvention which consists, briefly stated; in 'e rn oloying with wasteheat boilers a fr'ont sup erheater aconstruction similar to that oftherea-rj or-smoke-box.superheater' use'cl' with inte'r nally-firedboilersand in reversing the circulation of the furnacegase'stherethrough; thusmaking it possible with" a damper-control to avoid the overheating ofthe steam 'withoutfloss of [heat and without expensive andcomplicatedpmechanisml The invention is illustrated in the accompanyingclrawi ngsyin which;

Figure 1 1 s a view, in vertical longitudinal section, of a waste heat.boiler'an'cl'super 1 heater; embodying myfirnprovenients; Fig'.

2 a View of the same, in transverse section; Fig. 8 is-a iew, intransverse section; of a mod fiedrforrn of'the -superheater' in wh chthe waste gases are lIllllOiClUCQd there-'- tofrombelow'; and Fig. {1"is a view'sim'ilar to Fig/3 but showing two of the,

dampers in a different position.

ontroli Referring first 'toi Figsfil and 2',- l isthe I trOdRQfiQ f thWe i as s; I A 1 cylindrical ava e," which preferably boiler and 2is acylindrical wallor shell hich at'itsrearind isattachecl to the head ofthe boiler and forms an ezitlension,thereof;- "If-his'flentension drumis'closed atfits "outer.v i ndby headiwal qli ppe h a HOOP extends from,end to end of the drumleX- tension anddivides'the interior thereof intoa central flue, communicatingat one end with the inlet opening l and atthe other. end with the interior of the boiler and a surrounding annularchamber within'which is placed the superheater '3, comprisingtwo ing.

s emicir headers; preferably mounted upon the walls vo't the outer drum.

ular banks of'coils' with connecting A transverse wall 7, illiECl withinthis cylindrical inner wall, sub

'stantially midway its length, has formed therein a centrally-locatedopening 8 in which is mounted a damper 9, operable from outside the drumto open and close the open? The cyli'ndrical inner walls is door and thetransverse wall withi bottom opening10, which is controlledby the'two'dampers lO and 10 mounted therein and (operable;fronioutside the casing,and at its inner end, between the transverse wall and theiboiler, withajtop opening :11 whichis dampers controlled by two cor responding 11and 11 similarly mounted and'operated.

The operation of-the boiler andsu perheater {as/follows: To start thegboiler, thatv is to say, when the boiler is cold and] there is no steamin the superheater; the dampers. 10 10 andll and 11 are, closed and thedamper 9' is opened so that the waste gases fro nithe furnace will bedrawn into the boiler through the Qoentralfiue in through thesuperheater chamber, If the heat ofthe waste gases is so high as tooverheat the steam, as will frequently be the case, the temperature ofthe. steam can be readily be controlled for sample, by 010s ing oneofthe two dampers in each of the the steam in the openings 10 and 1 1 andby opening the damper 9 more or less. Although the waste gases will nowpass through one side only of the sup'erheater chamber, thetemperatureof two coils will be equalized at the headers. i l

. In the modification shown in Figs. 3 and 4 the waste gases areintroduced into the 'superheater from: below through thefiue pipe 12-and are conducted thence to the boiler either through the centralpassage formed by the cyl ndrlc-al: inner wall 13 0 throughnthesurrounding superheater chamber'forrned-between this inner wall and theicasing fl The inner' cyli der is. preferably secured; as before, to theinner face of a solid doorlremoyably mQuntedin-the outer'hejad V ofthesuperheaterlcasing; but here both the.

upper opening ltcoiitrolled the dampers I further provided at its outerend, between the end seaeoe la and 14: and the lower opening 15controlled" by the dampers 15 and15 extend throughou'tthe' entire lengthof thewall, the

latter dampers serving 1 either to close the openingl5 or on swingingdownwardly to connect this opening with the inlet pipe 12 'heater'chamber. i V r This form of superheater s controlled in operationsubstantially as bei'orei On start and shut off the inlet pipe from thesupering theboilerjthe dampers are set, as shown in l ign3i to close theopening 14 and to connect the opening 15' with the inlet pipe 12, thusdirecting the furnace gases directly to the boiler through. the'central,,passage.

Then; as steam is generated, the dampers are adjusted soas either toclose'theopen ings 14: and and thereby force "all oi the furnace gasesthrough the 'superheater' cham ber or as shown in Fig. 4, to clo'se'onesidev of each opening, thusdirecting a partof the gascsthrough one sideonlyof the superb ater, chamber and bypassing the remainder through thecentral passage.

Vi hatI claim as new, and desire to secure by Letters Patent, is--ii i vr l. The combinat on with a waste heat bOll r v of .a steamsuperheaterwhic'h 1536i? 1n front of the boiler and. comprises 'anfoutercasing" through which 'all the waste gases employed to heat theboilerfare passed,":an

inner cylindrical wallextending" from end to end of the casing and dviding ts inte- V riorinto an inner and surrounding outer,

chamber, two semi-circularly disposed superheater coils mounted withinthe outer chambet on opposite sides ofthe' inner'wall, and

means comprising damper-controlled openings for passing'the waste gassesfrom an inlet to an outlet opening in'the casing either directly throughthe iniierfc hamber or to. the extent desired through either orbjo'thsides ofthe outer chamber." l is a V 2. The combination with a wasteheatboiler of a steam'superheater which is set ahead of the'boile'r andcomprises an outer casing with the inlet opening for the admissionthereto of all the furnace gases employed to heat theboiler and anoutletopening connecting with theinteriorof the'boili- 7 'er, acylindricalinner; wall'extendingvfromthe front to the rear of thecasing'and at the rear encircling the outlet opening there from anddividing the interior of the casing intoa central inner and surroundingouter Y chamber, two semi circular' banks of superer controlled openingsassociated with the innerwall arranged and controllable to'con-.

nect/ the inlet with the outlet opening either -heater coils mountedwithin the outer chamheron the opposite sides thereof, and dampwhollythrough thecentral innerchamber or to close such ,eonne'ctionflto theextentlde-v sired and open" the connection for the pas-r sage. ofvarying quantities of the "furnace gases through either or bothsides ofthe annular' chamber coils. v i v c A steam snperheaterJcomprising, incombination, a casing adapted to be attached containing the superheaterat oneend to e boilerin communication with" i the gas-circulating systemthereof, an inner cylindrical WHllWlllCll extends from end to endof thecasing encirclihg the opening to he boiler and dividing the interiorthereof lnto an-inner central and surround ng outer hamber and which "isprovided Witha, top

fend bottom opening, two semi-circular banks of superheater coilsmountedWithin theonter chamber on opposite sides thereof and of the openings inthe innerWall, an inlet opening in the casing opposite one of the openings inthei nner Wall, and a pair of damp ers each operable to closeeither one-half of the said inner opening or the connectlon betweentheouter" casing opening and one ideof the outer superheater chamber.-

4. A steam' superheater comprising, in

cylindrical Wall which extendsfroin end to end otthe-caein'g encirclingthe outlet opening to the hoiler'and d viding the interior thereof intoconcentric. inner and annular outer chambers and which'has top and bot:

tom damper controlled openings extending" eubstentiallye the lengththereof, two seinicircular banks of Superhe'ater coils mounted Withinthe outer chamber on opposite sides thereof and of the openings in theinner Wall, and an inlet opening in the bottom of;

the casing registering with the'bottom open ing in the inner Wallthebottoni opening in the inner wall" being controlled by a pair iii oidampers each operable to oloseeither one? half. of said opening or theconnection l e-t openlng and one slde l ee j'l tile in-the outerchamber.

FRANZ FR. BERGER."

